| 摘要 |
PURPOSE:To prevent a scratch on an image carrier from occurring by forming a developer carrying area extending in the bus direction of the image carrier in the non-image area of the image carrier in the moving direction of the image carrier. CONSTITUTION:Timing that all the area extending in the longitudinal direction of a photosensitive drum 1 is made to carry toner in the middle of forward multirotation, that is, black belt timing is set. The black belt has length nearly the same as the width of a maximum transfer material in the bus direction (longitudinal direction) on the photosensitive drum 1, that is, in a shaft direction and specified width in the rotating direction of the drum 1. In the case of non-transfer that the transfer material does not exist at a transfer position, the black belt passes a transfer roller part 2 and reaches a cleaning part 9, is scraped by a blade 91 to be retained in the vicinity 93 of the blade. By forming the black belt and retaining toner in the vicinity part 93 of the blade, paper powder is prevented from being retained. Even though the paper powder is somewhat retained, it is mixed with much toner, so that the evil influence of the paper powder is reduced by the lubricative effect of the toner. Namely, since the toner uniformly rubs on the vicinity part 93 of the blade, the surface is not scratched. |
